on fleetness changing of throttle opening

 

 

ZHANG Yong ming, XV Jie, TIAN Jin yue

 

(School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China)

 

 

Abstract: Aming at the phenomenon of cyclic shift of an automatic transmission in engineering vehicle, dynamic analysis on the non steady condition of the engine was carried out. Study on the previous two parameters (the vehicle speed, the accelarator) and three parameters (the change of accelerator aperture, the vehicle speed, the accelarator) shift control strategies were compared and analyzed. A method of double fuzzy four parameter shifting control strategy was presented on the base of triple parameter optimum power shifting into which the change rate of throttle opening was added. Finally a Matlab/Simulink/Stateflow simulation was conducted, the correctness of control strategy was verified by comparison to the results of triple parameter control strategy. The results indicate that the frequency of the shifting and the shift shock was not only reduced effectively by the new shifting control strategy , the phenomenon of cyclic shift was also eliminated. The riding comfort of the vehicle has been improved.

 

Key words: engineering vehicle; change rate of throttle opening; fuzzy control; shift